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Service Spaces are components building on top of the above group communication infrastructure. They provide a logical group communication service, which restricts the view that clients have of the cluster to the sub-set of the nodes hosting a given Service Space.

For instance, Service Space 1 is hosted by Node 1 and Node 3. Clients on Node 1 using the logical group communication service of Service Space 1 only see Node 3. Also, they can only dispatch messages to Node 3.